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Highly Stable Normally-off GaN-based transistors via Structures and Process

Research Project

Project/Area Number 19K04528
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 21060:Electron device and electronic equipment-related
Research InstitutionUniversity of Fukui

Principal Investigator

Asubar Joel  福井大学, 学術研究院工学系部門, 准教授 (10574220)

Co-Investigator(Kenkyū-buntansha) 葛原 正明  関西学院大学, 理工学部, 教授 (20377469)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsGallium nitride / normally-off operation / power device / semiconductor / AlGaN/GaN HEMT / MIS / Insulated Gate / Normally-off / Hi-K dielectric / AlGaN / GaN / HEMT / 窒化ガリウム / 再成長 / ドライエッチング / ノーマリーオフ / エンハンスメントモード / リセスゲート / MIS-HEMT / Insulated-Gate
Outline of Research at the Start

本研究ではデバイス構造と独自のプロセス技術を組み合わせて、未だに実現されていない非常に安定したノーマリーオフ型窒化ガリウム(GaN)系高電子移動度トランジスタ(HEMT)の実現を目指す。ドライエッチングと後処理プロセスの組み合わせにより、ダメージフリーなドライエッチング技術を確立し、その表面上に高品質AlGaN障壁層の再成長、及びゲート絶縁膜を堆積し、熱処理を行うことで高効率電力スイッチング用途に適した、高い正の閾値電圧を持つ高安定なGaN系HEMTの実現を目指す。

Outline of Final Research Achievements

Using dry etching recipe and AlGaN regrowth technology originally developed by our group, we have achieved high performance normally-off operation in our GaN-based metal-insulator-semiconductor high-electron-mobility transistors (MIS-HEMTs).It was also found that the developed process is applicable not only to conventional Al2O3 insulator/AlGaN interfaces but also can be extended to Al(Ga)N/hi-K insulator systems. Furthermore, the fabricated insulator/regrown-AlGaN/GaN MIS capacitors revealed relatively low interface state density, leading to low hysteresis and highly stable operation. We have therefore succeeded in realizing low hysteresis, high performance normally-off GaN-based MIS-HEMTs using AlGaN layer regrown by metal-organic chemical vapor deposition (MOCVD).

Academic Significance and Societal Importance of the Research Achievements

AlGaN / GaN HEMTは、負のしきい値電圧を持つノーマリーオンデバイスである。これは、ゲート制御電圧が印加されていない場合でも、電流が流れてしまうことを意味する。回路が故障した際の安全を保証するために、正の高いVTHを持つノーマリーオフデバイスが望まれる。しかし、GaNベースのデバイス構造を使用して、高いVTH、大電流、および高安定性を同時に達成することは困難である。この研究の結果として、高いVTH、高最大ドレイン電流、および低ヒステリシスGaNベースのデバイスを実証した。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (39 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (13 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 13 results,  Open Access: 4 results) Presentation (17 results) (of which Int'l Joint Research: 10 results,  Invited: 1 results) Remarks (8 results)

  • [Int'l Joint Research] Slovak Academy of Sciences (SAS)(スロバキア)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Generalized Frequency Dependent Small Signal Model for High Frequency Analysis of AlGaN/GaN MOS-HEMTs2021

    • Author(s)
      Aakash Jadhav, Takashi Ozawa, Ali Baratov, Joel T. Asubar, Masaaki Kuzuhara, Akio Wakejima, Shunpei Yamashita, Manato Deki, Yoshio Honda, Sourajeet Roy, Hiroshi Amano, Biplab Sarkar
    • Journal Title

      IEEE Journal of Electron Devices

      Volume: 9 Pages: 570-581

    • DOI

      10.1109/jeds.2021.3081463

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Stoichiometric imbalances in Mg-implanted GaN2021

    • Author(s)
      Kai C Herbert, Kazuki Shibata, Joel T Asubar, Masaaki Kuzuhara
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: 6 Pages: 066504-066504

    • DOI

      10.35848/1347-4065/ac0248

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 5. Electrical properties of GaN-based MIS-HEMTs with Al2O3 gate insulator deposited by ALD and mist-CVD techniques2021

    • Author(s)
      S Urano, RS Low, M Faris, M Ishiguro, I Nagase, A Baratov, JT Asubar, T Motoyama, Y Nakamura, Z Yatabe, M Kuzuhara
    • Journal Title

      2021 IEEE IMFEDK Tech. Dig.

      Volume: 2021 Pages: 1-2

    • DOI

      10.1109/imfedk53601.2021.9637639

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fabrication and Characterization of ZrO2/AlGaN/GaN MIS-HEMTs with regrown AlGaN Layer2021

    • Author(s)
      S Maeda, I Nagase, A Baratov, S Urano, JT Asubar, A Yamamoto, M Kuzuhara
    • Journal Title

      2021 IEEE IMFEDK Tech. Dig.

      Volume: 2021 Pages: 1-2

    • DOI

      10.1109/imfedk53601.2021.9637576

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mist chemical vapor deposited-Al2O3/AlGaN interfacial characterization for GaN MIS-HEMTs2021

    • Author(s)
      Tomohiro Motoyama, Zenji Yatabe, Yusui Nakamura, Ali Baratov, Rui Shan Low, Shun Urano, Joel T Asubar, Masaaki Kuzuhara
    • Journal Title

      2021 IEEE IMFEDK Tech. Dig.

      Volume: 2021 Pages: 1-2

    • DOI

      10.1109/imfedk53601.2021.9637625

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Recessed gate GaN-based MIS-HEMTs with Al2O3 gate dielectric deposited by mist-CVD method2021

    • Author(s)
      M Ishiguro, S Urano, RS Low, M Faris, I Nagase, A Baratov, JT Asubar, T Motoyama, Y Nakamura, Z Yatabe, M Kuzuhara
    • Journal Title

      2021 IEEE IMFEDK Tech. Dig.

      Volume: 2021 Pages: 1-2

    • DOI

      10.1109/imfedk53601.2021.9637518

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 1. Modified Small Signal Circuit of AlGaN/GaN MOS-HEMTs Using Rational Functions2021

    • Author(s)
      Aakash Jadhav, Takashi Ozawa, Ali Baratov, Joel T Asubar, Masaaki Kuzuhara, Akio Wakejima, Shunpei Yamashita, Manato Deki, Shugo Nitta, Yoshio Honda, Hiroshi Amano, Sourajeet Roy, Biplab Sarkar
    • Journal Title

      EEE Transactions on Electron Devices

      Volume: 68 Issue: 12 Pages: 6059-6064

    • DOI

      10.1109/ted.2021.3119528

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Controlling surface/interface states in GaN-based transistors: Surface model, insulated gate, and surface passivation2021

    • Author(s)
      Joel T. Asubar, Zenji Yatabe, Dagmar Gregusova, Tamotsu Hashizume
    • Journal Title

      Journal of Applied Physics

      Volume: 129 Issue: 12 Pages: 121102-121102

    • DOI

      10.1063/5.0039564

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] GaN-based MIS-HEMTs with Al2O3 dielectric deposited by low-cost and environmental-friendly mist-CVD technique2021

    • Author(s)
      Rui Shan Low, Joel T. Asubar, Ali Baratov, Shunsuke Kamiya, Itsuki Nagase, Shun Urano, Shinsaku Kawabata, Hirokuni Tokuda, Masaaki Kuzuhara, Yusui Nakamura, Kenta Naito, Tomohiro Motoyama, Zenji Yatabe
    • Journal Title

      Applied Physics Express

      Volume: 14 Issue: 3 Pages: 031004-031004

    • DOI

      10.35848/1882-0786/abe19e

    • NAID

      120007160996

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Design considerations for normally-off operation in Schottky gate p-GaN/AlGaN/GaN HEMTs2020

    • Author(s)
      Hirokuni Tokuda, Joel T. Asubar, Masaaki Kuzuhara
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 8 Pages: 084002-084002

    • DOI

      10.35848/1347-4065/aba329

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Enhancement‐Mode AlGaN/GaN Vertical Trench Metal-Insulator-Semiconductor High‐Electron‐Mobility Transistors with a High Drain Current Fabricated Using the AlGaN Regrowth Technique2020

    • Author(s)
      Akio Yamamoto, Keito Kanatani, Norifumi Yoneda, Joel, T. Asubar, Hirokuni Tokuda, and Masaaki Kuzuhara
    • Journal Title

      Physica Status Solidi A

      Volume: 217 Issue: 7 Pages: 19006221-7

    • DOI

      10.1002/pssa.201900622

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Enhancement-Mode AlGaN/GaN MIS-HEMTs With High VTH and High IDmax Using Recessed-Structure With Regrown AlGaN Barrier2020

    • Author(s)
      Joel T. Asubar, Shinsaku Kawabata, Hirokuni Tokuda, Akio Yamamoto, and Masaaki Kuzuhara
    • Journal Title

      IEEE Electron Device Letters

      Volume: 41 Issue: 5 Pages: 693-696

    • DOI

      10.1109/led.2020.2985091

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of reactive-ion-etching depth on interface properties in Al2O3/n-GaN MOS diodes2019

    • Author(s)
      Hirokuni Tokuda, Sayaka Harada, Joel T. Asubar, and Masaaki Kuzuhara
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 58 Issue: 10 Pages: 1065031-6

    • DOI

      10.7567/1347-4065/ab3d11

    • NAID

      210000156988

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Characterization of mist-Al2O3 gate insulator and its applications in mist-Al2O3/AlGaN/GaN MOS-HEMTs2022

    • Author(s)
      Tomohiro Motoyama, Shun Urano, Ali Baratov, Yusui Nakamura, Masaaki Kuzuhara, Joel T. Asubar, and Zenji Yatabe
    • Organizer
      The 69th Japan Society of Applied Physics Spring Meeting 2022
    • Related Report
      2021 Annual Research Report
  • [Presentation] AlGaN/GaN MIS-HEMTs with mist- and ALD Al2O3 gate dielectric2022

    • Author(s)
      Shun Urano, Joel T. Asubar, Rui Shan Low, Faris Muhammad, Masaki Ishiguro, Itsuki Nagase, Ali Baratov, Tomohiro Motoyama, Yusui Nakamura, Masaaki Kuzuhara, and Zenji Yatabe
    • Organizer
      The 69th Japan Society of Applied Physics Spring Meeting 2022
    • Related Report
      2021 Annual Research Report
  • [Presentation] Recessed gate GaN-based MIS-HEMTs with Al2O3 gate dielectric deposited by mist-CVD method2021

    • Author(s)
      M. Ishiguro, S. Urano, R. S. Low, M. Faris, I. Nagase, A. Baratov, J. T. Asubar, T. Motoyama, Y. Nakamura, Z. Yatabe, M. Kuzuhara
    • Organizer
      2021 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fabrication and Characterization of ZrO2/AlGaN/GaN MIS-HEMTs with regrown AlGaN Layer2021

    • Author(s)
      S. Maeda, I. Nagase, A. Baratov, S. Urano,J. T. Asubar, A. Yamamoto, M. Kuzuhara
    • Organizer
      2021 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mist chemical vapor deposited-Al2O3/AlGaN interfacial characterization for GaN MIS-HEMTs2021

    • Author(s)
      Tomohiro Motoyama, Zenji Yatabe, Yusui Nakamura, Ali Baratov, Rui Shan Low, Shun Urano, Joel T. Asubar, Masaaki Kuzuhara
    • Organizer
      2021 IEEE International Meeting for Future of Electron Devices ,Kansai (IMFEDK 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Electrical properties of GaN-based MIS-HEMTs with Al2O3 gate insulator deposited by ALD and mist-CVD techniques2021

    • Author(s)
      S. Urano, R. S. Low, M. Faris, M. Ishiguro, I. Nagase, A. Baratov, J. T. Asubar, T. Motoyama, Y. Nakamura, Z. Yatabe and M. Kuzuhara
    • Organizer
      2021 IEEE International Meeting for Future of Electron Devices ,Kansai (IMFEDK 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improved Interfaces of high-K ZrO2 and AlGaN via ex-situ MOVPE regrowth2020

    • Author(s)
      Itsuki Nagase, Joel T. Asubar, Rui Shan Low, Shun Urano, Shunsuke Kamiya, Ali Baratov, Hirokuni Tokuda, Akio Yamamoto, Masaaki Kuzuhara
    • Organizer
      The IEEE 2020 International Meeting for Future of Electron Devices, Kansai (IMFEDK 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effect of Post-Metallization Annealing on Properties of ZrO2/regrown-AlGaN/GaN structures2020

    • Author(s)
      Shun Urano, Joel T. Asubar, Itsuki Nagase, Rui Shan Low, Shunsuke Kamiya, Ali Baratov, Hirokuni Tokuda, Akio Yamamoto, Masaaki Kuzuhara
    • Organizer
      The IEEE 2020 International Meeting for Future of Electron Devices, Kansai (IMFEDK 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Characterization of mist-CVD deposited Al2O3 films on AlGaN/GaN heterostructures2020

    • Author(s)
      Tomohiro Motoyama, Kenta Naito, Yusui Nakamura, Zenji Yatabe, Rui Shan Low, Itsuki Nagase, Ali Baratov, Hirokuni Tokuda, Masaaki Kuzuhara, Joel T. Asubar
    • Organizer
      The IEEE 2020 International Meeting for Future of Electron Devices, Kansai (IMFEDK 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] GaN-based MIS-HEMTs with Mist Chemical Vapor Deposited Al2O32020

    • Author(s)
      Low Rui Shan, Itsuki Nagase, Ali Baratov, Joel Tacla Asubar, Hirokuni Tokuda, Masaaki Kuzuhara, Zenji Yatabe, Kenta Naito, Motoyama Tomohiro, Yusui Nakamura
    • Organizer
      IEICE Electron Device 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Enhanced Breakdown Voltage in AlGaN/GaN HEMTs by Oxygen Plasma Treatment2020

    • Author(s)
      Shunsuke Kamiya, Takashi Nishitani, Yu Matsuda, Nozomu Takano, Joel T. Asubar, Hirokuni Tokuda, Masaaki Kuzuhara
    • Organizer
      IEICE Electron Device 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Improved performance in GaN-based HEMTs with insulated gate structures2020

    • Author(s)
      Ali Baratov, Takashi Ozawa, Shunpei Yamashita, Joel T. Asubar, Hirokuni Tokuda, Masaaki Kuzuhara
    • Organizer
      IEICE Electron Device 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Normally-off Recessed-gate ZrO2/AlGaN/GaN MIS-HEMTs with Regrown AlGaN Barrier2020

    • Author(s)
      Itsuki Nagase, Joel T. Asubar, Rui Shan Low, Shun Urano, Hirokuni Tokuda, Akio Yamamoto, Masaaki Kuzuhara
    • Organizer
      Solid State Devices and Materials 2020 (SSDM 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recent progress in Normally-off GaN-based transistors2019

    • Author(s)
      Joel T. Asubar, Shinsaku Kawabata, Hirokuni Tokuda, Akio Yamamoto, and Masaaki Kuzuhara
    • Organizer
      日本表面真空学会 関西支部 合同セミナー2019
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Threshold voltage control in normally-off Al2O3/AlGaN/GaN MOS-HEMTs through Al2O3 thickness variation2019

    • Author(s)
      Shinsaku Kawabata, Joel Asubar, Hirokuni Tokuda, Akio Yamamoto, Masaaki Kuzuhara
    • Organizer
      The 80th JSAP Autumn Meeting 2019
    • Related Report
      2019 Research-status Report
  • [Presentation] Improved insulator/semiconductor interfaces in Al2O3/AlGaN/GaN structures by AlGaN layer regrowth2019

    • Author(s)
      Shinsaku Kawabata, Joel T. Asubar, Hirokuni Tokuda, Akio Yamamoto, and Masaaki Kuzuhara
    • Organizer
      Compound Semiconductor Week 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Impact of regrown AlGaN layer on the properties of Al2O3/AlGaN/GaN metal-insulator-semiconductor structures2019

    • Author(s)
      Joel T. Asubar, Shinsaku Kawabata, Low Rui Shan, Hirokuni Tokuda, Akio Yamamoto, and Masaaki Kuzuhara
    • Organizer
      Workshop on Compound Semiconductor Devices and Integrated Circuits held in Europe (WOCSDICE 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] Google Scholar

    • URL

      https://scholar.google.com/citations?user=1NlRAggAAAAJ&hl

    • Related Report
      2020 Research-status Report
  • [Remarks] Researchgate

    • URL

      https://www.researchgate.net/profile/Joel-Asubar

    • Related Report
      2020 Research-status Report
  • [Remarks] Researchmap

    • URL

      https://researchmap.jp/joel_asubar/

    • Related Report
      2020 Research-status Report
  • [Remarks] Publons

    • URL

      https://publons.com/researcher/2992442/joel-asubar/

    • Related Report
      2020 Research-status Report 2019 Research-status Report
  • [Remarks] Homepage

    • URL

      https://sites.google.com/view/uf-electron-device-lab/home-%E3%83%9B%E3%83%BC%E3%83%A0?authuser=0&fbclid=IwAR0mknc9L9NLHw09aebxv-BH_1va6I98_JG6jY9iS_hg7scmDFmSsg5HOA4

    • Related Report
      2020 Research-status Report
  • [Remarks] Google Scholar

    • URL

      https://scholar.google.com/citations?user=1NlRAggAAAAJ&hl=en

    • Related Report
      2019 Research-status Report
  • [Remarks] Researchgate

    • URL

      https://www.researchgate.net/profile/Joel_Asubar

    • Related Report
      2019 Research-status Report
  • [Remarks] Researchmap

    • URL

      https://researchmap.jp/joel_asubar/?lang=english

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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